Calculate the minimum distance at which a person should stand in front of a reflecting surface to be able to hear an echo if the speed of sound in air is 320 m/s.
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The minimum distance from reflector is 16.6 m. Answer: To hear an echo, the sound wave has to reach an obstacle and then return back to you. ... So the minimum distance required to hear an echo in air is achieved by: d=343*0.05 or, d=17.15 Therefore to hear echo in air at room temperature, the minimum distance is 17.15m.
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